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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b236d4da7c95f9c22980774f3afb44610ed12f3953dbb06183e2b8a92ae49806' 
  AND token = '+p1zB0bikTBs8HVYPvoTG3dm/t2jW3Ecrm42rTvfTgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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