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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c65c0732f69b51c98801816e0576c6b1f8fba535b9bd580995af94788794ce' 
  AND token = '4+3aMyz0S3rbpmOtmD7CPKHkKoSR3eTsdDrr0TfNzpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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