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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215580e5872e9a300766a64a9e3236afd0220c917065b02af475d612df81ffac' 
  AND token = 'K8VbX2r1LnkCSDabbR7yQ1baUUExgbqwQkTUic4TmQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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