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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2e0ed6aadd81dac08dd88f3534dd914bf2209bb52baa77a73c4fcbb81ff4cd1' 
  AND token = '7lwdRC9rI3O4WOSB5I7gZA2fSJp40qQPGH2fYjBzLPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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