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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bd1d5e1e79c3f265c0e63270ac6cb0cf77a4cea0c6615ef9d6b77b4435e5e0' 
  AND token = 'Dg26RhxsWfnJBeuGU73fbI6TCmkaXFOu9pAdJ9fe37k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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