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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbb6040d36153e16623b458ee2e76d1e37f0c5729cf9a221f6a703d75df2dc1' 
  AND token = 'h5MeZqXvSAa3cBVlMIBJeHi99eiyCrohiCadhWcMR2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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