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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea797695fec7e1b64ce06342d0d4b4e3a0daecefa14df23fd711145083d4d76' 
  AND token = 'mYuA9Q5licqy/IlrRT2niqesSxihGDBmyulEbpvLpOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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