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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b4d6abac90e9b11447abdfa0dc371709fbb96c9a494e285b774ca9c40857af' 
  AND token = 'ekcY4cMlUVfElFcMNnMRytNk4irp5l/WfaEz9GJJDk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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