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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc157d07fd5bad14a8051932c71fcd73d401bce316ac3db0f7a58795e08ce623' 
  AND token = 'si/aLjQ4NygZiaPOtSstjO8ANpUM8CTMsUnyTTF1B+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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