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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4543e5f0e5235d544b3e2f169db650ae2917b4b7173eca1a77f34fa9d82e7e' 
  AND token = 'gZ4Gbh3XeDdGUVJBKMbTojbiLf+2tBhWedht1w1foVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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