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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a663725139a90f81e83b2974c415628d0c716a4c97e2f2adc5542ac867dc65' 
  AND token = '4qA22zPgBj/ed99bGNmdNsev6Y1tU45q74HKTH1NX1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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