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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdde5a27e3d45624d2921960bab05c19b242e5677f8f956adcbbe9c521e24a96' 
  AND token = 'SOEXJnky1tg9AgzSDcJiNgA67ZpwF41Pk6HyIqagm7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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