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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fedb5d9145e17d9814c38e6417fe0ae563828ca3dba265555a53638c4094d2' 
  AND token = 'Rh2CLyLc0P2GXAGr1PLSjr9WME7vqTXnArAkh3VuyRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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