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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d6d1c43e628dbcef81a4e40f9e15acba62e584f2bc9c0c5c2b38d267c826fb' 
  AND token = '8ptH4EgRItH/JwfleWtskKpivCr95cLAEt6eGLSAsCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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