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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1f19f39b3a96649219e10e44ee153d119d7d50cf5a9efb97df3e4eac8eda4a' 
  AND token = '26w6xbzEdwOiMM7ri18F0Xq9waOaS1yjKWgXG9UIsaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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