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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16b605545ac4a5d1f28ce6b12cf8981c9fec2a55bb15cde3d066f57b5988a5b' 
  AND token = '6wq7jWkINrrEay4z3n0o4oUyDoVVv82WzqcwbaaKoa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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