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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c9b88c7a222c38818a94dbb592dcbc3e56ec23082df51924eaf30df436c901' 
  AND token = 'j0f1Bt4uURsXPe9J+88FJG4CgKaloONgHIcG1VObB/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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