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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2b46a2ccc17ca91b0582edacd4ff404b4d6d84c998f879c4fa38d16dc9a9b2' 
  AND token = 't7IAFeAPCtfALgnpEKiriKa2aHvdVmsaxI2YWgusIRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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