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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca318eb42deae0989b4a3c0dbb624ee31073eeb178b2df171c19a5d981c1db9' 
  AND token = '+7YxVVx/FfY9MgCoMDDBVp6xtb7PWCfwpp2fDlzJGds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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