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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a50e2e203200ce1029748f2774384c1fe9ff2c3988b634322e87a2fe0c6d31' 
  AND token = '63wttGv4G8hdcm6tyYTOAguyjtd6JS/286efeeor570=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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