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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74260c45a91eb4fd70ef0f4c0a5da9d074e702a2bd5cf433a41c5dcffc73e9d3' 
  AND token = '4DnKzVADcf6j8OzOLvA7B05ACmEJWeStwvuZyXnPIvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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