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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7337622d4003c38fe7a881a40afd141cbcda443f81d69696538dfc094354e5' 
  AND token = '9qt6i09McUxjo/xx++c87r8m250ReF1U444yEgFmy90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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