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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464c4269d98dacfad84dce510e207dcffa5b00d3c7f3ce6388258532082edafa' 
  AND token = '7wdWGS3cIa831dPWXJU1ApWw/vQcYAYXcg5kooICOqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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