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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549f4931bb3f259821262961cc0ff2ed3257fdfb6d4f12090736c30c437b103f' 
  AND token = 'Oug/HmpH938eZX2kXamz+g+SDy+iFiC94zHR2dD43Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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