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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6213a4b191adf5d92e0a33f2a5524bbde630d618c01ddeb08c94751d34e8e5' 
  AND token = 'jprVXlJK4+3wS4B+rVluyLkWDNb96iKRT2oIwivw/7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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