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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d975989dcab672ad7cd825e1c266a8573fbadd35cbe0f2b7a29d4ad4f274b4' 
  AND token = 'Xg8rs/7lHHo/tr13+yFgNLBxxkk2vjTvU1/ySr1xgSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}