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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeef927d7e951757faf17f1fe00d6733ebfaf4e23449977d19510cc2e537f9f4' 
  AND token = '67B+zfLN29qoZIUSYRFL+Ps4WRv8ry1UzV4YNQpv/5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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