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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3b839f15a9b8f2fde3aadfc71cc6dad932e8182da0ffaa01d74b21faa4d807' 
  AND token = '5d24477LadYerRJ/ryQNCMahaT96qIjU4DXpUq9khhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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