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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ad852dab390dd45e43637c886659df1de9fb56fc4a48078423d420ab6606b0' 
  AND token = 'i/GnKt4uX5n/fwI/Wb9lseR714unnO4duSRaVB+TaRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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