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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee085ed6d7aafb077ee712e0d9af9091c871f3fafb85d166a9f26c82f715c00c' 
  AND token = 'meORONe6h/xdaa4saEIx4wHmVhfdSThpzypG07oqQHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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