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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154b9097699ffc2e36068c75169d1deeb16d2bfadd788db276ae63930beae873' 
  AND token = 'GlEY0bcGe2QeDoVmiDwwc7+URmYRF9PNou3jRQXrYGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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