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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8bee9b86557a5829b085e75a93f27667a2f92068eae1655d0d5971c2d627e17' 
  AND token = '2ELuEPl7CHv1tS1C5FbMqXvh9sC7s9PZErESPYGntG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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