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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07500b74e4eab781ba6be3aed72b39d1ea587555977c4c282e6889fa4a6e1056' 
  AND token = 'iEKDQ8ODkIQ9NyS5R/fi5gvQ/VCCAYe2ajcfr3KMKUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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