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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a79e3b7ebd379d35018fdb2ec19a2ddb21dcc159e4d155b12a0dbdbf2833b12' 
  AND token = 'IDYoCLRnIptNOZqcgJnM4suqkr/HeKx58Jeq9aQ8aJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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