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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8059643aaffff1fe4340aca58ce42fb6621f7743093c7b3e023b629600367cc2' 
  AND token = 'SZ7DKwEfe4y6C1ePxikpf3VDPXyP68TL+jFfhXeuU3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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