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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76480b95b4b5f869529cc90ad18ffb11e87b1777491983036213b2eefa70421f' 
  AND token = 'SAry9CRQHeZZMGH7jH0gVFq0kEVy9gCbyWXg9B1rDoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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