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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce584ee56e27431e9df2990f6d8e8d0afca257c7a32ca37c42c170c2ad58948b' 
  AND token = 'AX+bAWjPFOsWktHs5iD3WhqqXMcnYgByE2+oHw5c6OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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