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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7299f0da50702286f182cfd563c662937c597d47166bc66d0224e57ebf3864' 
  AND token = 'EpWh/TGsbhlbU0W+KVfrEAH/B+Cflmfs10rd47Y79Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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