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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4675fdf82802b60dd0bc2a9123ecefb0e8b336ae7808c65bef96e07aa052626' 
  AND token = 'cFnYcBfatiYmBsD8V5QvdArcvitTijl/Bipt8JkG3ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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