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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a825f5f4a998064857f9928c04652aba6fa29a8596335f568bf372bd334008b3' 
  AND token = 'g3mj0wMEekj+sxeZ6iy+ZR/2OzoS3xxK81qbK9fJPlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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