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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5150856ec23a7e6aa5178ff8a1fe2f2d2e47cd02899894081d9ea2d3765a74c2' 
  AND token = 'Map2zQE07P5BhNruy97TC4jvU4C32feHJDnhHUlf5tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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