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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a5440ff66793ae4b704a5ca5ee22a7499ec678ffcad0b3751a8fd49ef8bca2' 
  AND token = 'obW1RQZfPlGnnOEdxEde8NxW64LPmiLTySU7s2HbCn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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