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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6860a4398426eb768bbefc373237db5ec45c0881273d6134fddd0b0b852015e0' 
  AND token = 'zDX4c4ZWASQJr/Y/9j8bl8prewRn8i8SoliiIWw+gZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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