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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92d06f79631ad198d3b4f4c0178686e53ea155814d2c50cab00707cae96c2bf' 
  AND token = 'm7Prl5MUFR1X5bUJw0Wte8MN8o7rI1wr82lvE1KayXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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