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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01ee675fbf678dc11e0504ba2538c7d5f91c5b1244ec1b6a6477738c868c950' 
  AND token = '/jSAtGxNn3s0FpyhlDKkVx7ArnernxvGg+YdJsnGGyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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