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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6d333f21dfe1593b9f82f0b081737cddf5040b8db666c3f2ea187e00fb6831' 
  AND token = 'dojlNqd4Th/2DM1pNmvlSmtlyN9ytRGyPS/c2dELOmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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