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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55be6172c8be3be7d925c4d628ffe939e6ab796eb77d562e0c08f0ee63409224' 
  AND token = 'sIIMfdeWtFXN3D7rSXZAiw93dO0cqfD4ntaIFDzL0TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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