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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d4b392b0b2dff3cbac1c91a2c5e0b6bfd3a1404aca104b08faea83bfabdbd5' 
  AND token = '2Dwj1dIw4J0GD7mkpgoIP3Rcwurgvm10yEecX96GCx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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