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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a1a8f717f8832f3232de3756f55a0e3f70aa0008b1fa7ff6b8e3f1ae2a8148' 
  AND token = 'zQ65AnyzXpJA+Khvzio26yM7oIKh/JtJzD9bYkzg2fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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