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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839b4fbb2873888f20968722c984c04c4604c3119e41b571dc25a28f389900d5' 
  AND token = 'O14NXbVr855yNarW45MNexE7B1NnlIzqd7eOmZ16ha0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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