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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134c3cbc4c7e496ace7a1851943a77e27f246e4a12cac8a9bde1d16fa0a0a92e' 
  AND token = '4Wygp59LtuvrpPpKajm16vlRaefh6QC+rZqnH793LHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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