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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa652cc556ce65c1a372d5d8c59ea1507990d5d99e4e006812d1e372f78a46bc' 
  AND token = '+EzQGUggNxRCJzDrqw6yOI+D+ipypaL9ROlzoYv8W3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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