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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860f5dafd8625ba39dfb9d25c6018e2b3f88754f6a7acc020168a4479d4569b4' 
  AND token = 'NYV39QzXxO8/VSltfj5lui5J+ZSvtlJ873dS2b+HIak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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