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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c9a3d0692f838ff91193a8365d4b559b8eedeae4bcb9cbb87a7b87a999d04c' 
  AND token = 'MJgWX+wL1CQZF+EjYLcc897P2CX+YnnX1alCJrQlYyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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