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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f66a14f14abb60fd638e32c8fcabb5ee630e4cd69ce9d145da252e4f9451629' 
  AND token = 'fhnK0QaybfEmgxlQ0m+GRO3NVq0mHlHl8+GoNIl+KKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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