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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89419a2a186da193e208ccea18db5b7826c9bddf8252a2fd222d5bf5a3af0aa2' 
  AND token = 'Y/wV6hXQJHsB14UVLDOeBUbpCXFbimSs2tKzwW0+aH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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