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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bf9ca5b18ce8b700d3105cb3099def5c567673e15fd5845838eaca0698a8d4' 
  AND token = 'URkaetN2WH/31sQ7hpkoN82+4NfmPB4DChJPkfK4/hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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