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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4ac3c90baaac1bfe4768559474468f444877749d230ff54cce21de9ab046cb' 
  AND token = 'G3TxInYFfXyTYOdHQTpH+RRP6/LyVp44Vt29PQc2/UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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