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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e8cd5bf332b2ee621c631abe839aca9a1ab482d6d551651e30f45a058f2884' 
  AND token = 'Pyib40tfWKQAkaiYeGKog2Los3hiP8G1ueeU/RhWTdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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