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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14476025c0dfdff1258ba82900655573bce2272c0b63790a44286c8d99ddab6' 
  AND token = 'xdUDOQwWkRIc4UYt9D5Uocf94o+l3blIJFitVOSTtr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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